The Chinese government is said to be planning to require all PCs sold within the country to be shipped with software that blocks certain Web sites from users. Called "Green Dam-Youth Escort," the software would block access to government banned Web sites by regularly connecting to a database of banned sites and blocking access to those addresses. The government is claiming the intent is to protect young people from "harmful" content such as pornography, however recently during the 20th anniversary of the Tiananmen Square massacre, the Chinese government blocked access to many social media and video sharing sites. It would appear as though their efforts at a network level are insufficient to block access to all of the content they are attempting to censor.
Source: CNet
Source: CNet
